issue##15029
As required by https://developer.apple.com/support/third-party-SDK-requirements/
Protos does not collect data.
Required reason APIs searched for using:
```
grep -ER 'NSFileCreationDate|NSFileModificationDate|fileModificationDate|NSURLContentModificationDateKey|NSURLCreationDateKey|getattrlist\(|getattrlistbulk\(|fgetattrlist\(|stat\(|fstat\(|fstatat\(|lstat\(|getattrlistat\(|systemUptime\(|mach_absolute_time\(|NSURLVolumeAvailableCapacityKey|NSURLVolumeAvailableCapacityForImportantUsageKey|NSURLVolumeAvailableCapacityForOpportunisticUsageKey|NSURLVolumeTotalCapacityKey|NSFileSystemFreeSize|NSFileSystemSize|statfs\(|statvfs\(|fstatfs\(|fstatvfs\(|getattrlist\(|fgetattrlist\(|getattrlistat\(|activeInputModes|NSUserDefaults' .
```
```
./third_party/utf8_range/utf8_to_utf16/main.c: if (fstat(fd, &stat) == -1) {
./third_party/utf8_range/main.c: if (fstat(fd, &stat) == -1) {
./src/google/protobuf/map.h: s = mach_absolute_time();
./src/google/protobuf/io/io_win32.cc:int stat(const char* path, struct _stat* buffer) {
./src/google/protobuf/io/io_win32.cc: return ::_wstat(wpath.c_str(), buffer);
./src/google/protobuf/io/io_win32.cc: return ::_stat(path, buffer);
./src/google/protobuf/io/io_win32.h:PROTOBUF_EXPORT int stat(const char* path, struct _stat* buffer);
./src/google/protobuf/testing/file.cc: if (lstat(name.c_str(), &stats) != 0) return;
./src/google/protobuf/compiler/importer.cc: ret = stat(std::string(filename).c_str(), &sb);
```
`./third_party/utf8_range/...` - tool for utf that is not in user binaries
`./src/google/protobuf/map.h` - resolved with pull#15554
`./src/google/protobuf/io/io_win32.cc` - windows code
`./src/google/protobuf/testing/file.cc` - testing code not in user binaries
`./src/google/protobuf/compiler/importer.cc` - compiler code not in user binaries
So no required reason APIs.
Apple has not yet communicated how this is to be put into podspecs so saving for future commit.
Closes#15557
The CocoaPod (and source) have always support tvOS, but adding the project
makes it easier to run the tests and debug if there ever were an issue.
(not adding a watchOS project at the moment because Apple doesn't provide
XCTest, so all it could do is build the library. We still support that,
just can't "test" it.)
dmaclach
listonjesse
Thomas Van Lenten